Pipe ring apparatus and method

ABSTRACT

An apparatus and method according to which the apparatus includes a pair of connected arcuate members for clamping around a pipe, with each arcuate member including at least one protrusion. The arcuate members have a first material hardness and at least a portion of the at least one protrusion has a second material hardness that is greater than the first material hardness so that the portion penetratingly engages the pipe when the arcuate members are clamped around the pipe.

CROSS REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. patent application Ser. No. 10/971,407, filed on Oct. 22, 2004.

BACKGROUND

The present invention relates in general to an apparatus for installation on a pipe and in particular to an apparatus employed in the restraint of connected pipes to prevent the separation thereof.

A conventional connection that joins two adjacent pipes in a fluid-transporting pipeline system is sometimes subjected to internal hydrostatic pressure and/or other external and/or internal forces that tend to deflect or separate one pipe from the other. To combat this separation, a pipe-restraining assembly may be installed across the connection between the two pipes to penetratingly engage and maintain the pipes in a fixed position relative to each other.

However, a typical pipe-restraining assembly may not be suitable for all types of pipe materials. That is, the ability of the pipe-restraining assembly to penetratingly engage and restrain a pipe is dependent upon the pipe surface having a material hardness that is relatively low. Thus, the pipe-restraining assembly may not be able to prevent the axial separation of pipes having relatively high material hardness levels.

Therefore, what is needed is an apparatus for installation on a pipe and an accompanying method that, among other things, may be used to overcome the above-described problem.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a pipe-restraining assembly according to an embodiment of the present invention and clamped around connected pipes.

FIG. 2 is an exploded view of the pipe-restraining assembly of FIG. 1.

FIG. 3 is a detailed perspective view of a portion of the pipe-restraining assembly shown in FIG. 2.

FIG. 4 is an elevation view of the pipe-restraining assembly of FIG. 1.

FIG. 5 is another elevation view of the pipe-restraining assembly of FIG. 1.

FIG. 6 is a partial perspective/partial section view of a component of a pipe-restraining assembly according to an embodiment of the present invention.

DETAILED DESCRIPTION

Referring to FIGS. 1-2, a pipe-restraining assembly according to an embodiment of the present invention is generally referred to by the reference numeral 10 and is designed to be installed on connected pipes 12 and 14. The pipe 14 includes a bell 14 a which receives a conventional spigot extending from the pipe 12 (spigot not shown). The pipes 12 and 14 are sealingly engaged in any conventional manner, and may be made of any conventional pipe material such as, for example, polyvinylchloride (PVC) or ductile iron.

The assembly 10 includes two spaced pairs of arcuate members 16 a and 16 b, and 18 a and 18 b. Each pair of arcuate members 16 a and 16 b, and 18 a and 18 b, forms a ring that envelops portions of and clamps around the pipes 12 and 14, respectively.

As more clearly shown in FIG. 3, with continuing reference to FIGS. 1-2, opposing flange members or ears 20 a and 20 b extend outward from each end of the arcuate member 16 a. Each ear 20 a and 20 b includes a chamfer 22 a and 22 b and a horizontal surface 24 a and 24 b, respectively. Openings or bores 26 a and 26 b are formed through the ears 20 a and 20 b, respectively. Lugs 28 a and 28 b extend from the arcuate member 16 a and are positioned so that the spacing between the ear 20 a and the lug 28 a, and the spacing between the ear 20 b and the lug 28 b, are equal along the curved length of the arcuate member. Each lug 28 a and 28 b defines a through-opening or bore 28 a′ and 28 b′, respectively.

The arcuate member 16 a defines a curved surface 30, with the opposing ends of the curved surface 30 terminating at the chamfers 22 a and 22 b. A plurality of protrusions or ridges 32 a, 32 b, 32 c and 32 d extend radially inward from the curved surface 30 so that the distal ends of the ridges 32 a-32 d are radially offset from the curved surface 30. The ridges 32 a-32 d also extend along the length of the curved surface 30. The curved surface 30, and the ridges 32 a-32 d, include opposing portions 34 a and 34 b which are substantially defined by and substantially extend from the ears 20 a and 20 b, and to the lugs 28 a and 28 b, respectively. At least some of the material in each of the portions 34 a and 34 b has a material hardness that is higher than the remainder of the arcuate member 16 a, including the remainder of the curved surface 30 and the ridges 32 a-32 d. It is understood that the portions 34 a and 34 b may be caused to have a material hardness that is higher than the remainder of the arcuate member 16 a by performing a material-hardening process of such portion such as, for example, a conventional heat treating process.

The arcuate members 16 b, 18 a and 18 b are identical to the arcuate member 16 a and thus will not be described in detail. Parts of the arcuate members 16 b, 18 a and 18 b corresponding to identical parts of the arcuate member 16 a are given the same reference numerals.

Referring to FIGS. 4-5, with continuing reference to FIGS. 1-3, bolts 36 a and 36 b extend through the vertically-aligned bores 26 a and 26 b of each arcuate member 16 a and 16 b. Nuts 38 a and 38 b are threadably engaged with the bolts 36 a and 36 b, respectively, and contact the ears 20 a and 20 b, respectively, thereby connecting the arcuate members 16 a and 16 b and clamping the members around the pipe 12. The surface 24 a of each arcuate member 16 a and 16 b contacts the corresponding surface 24 a of the other arcuate member, and the surface 24 b of each arcuate member contacts the corresponding surface 24 b of the other arcuate member. The ridges 32 a-32 d of each arcuate member 16 a and 16 b penetratingly engage the pipe 12.

Likewise, bolts 40 a and 40 b extend through the vertically-aligned bores 26 a and 26 b of the arcuate members 18 a and 18 b, respectively, and are threadably engaged with nuts 42 a and 42 b, respectively. These threaded engagements connect the arcuate members 18 a and 18 b and clamp the members around the pipe 14. The surface 24 a of each arcuate member 18 a and 18 b almost contacts or contacts the corresponding surface 24 a of the other arcuate member, and the surface 24 b of each arcuate member almost contacts or contacts the corresponding surface 24 b of the other arcuate member. The ridges 32 a-32 d of each arcuate member 18 a and 18 b penetratingly engage the pipe 14.

A tie rod 43 extends through each aligned bore 28 a′ of the arcuate members 16 b and 18 b so that the tie rod is in a parallel relation with the coaxial longitudinal axes of the pipes 12 and 14. Nuts 44 a and 44 b are threadably engaged with the distal and proximal ends of the tie rod 43, respectively, thereby connecting the arcuate members 16 a and 16 b with the arcuate members 18 a and 18 b. In an identical manner, a tie rod 46 extends through each aligned bore 28 b′ of the arcuate members 16 b and 18 b, and nuts 48 a and 48 b are threadably engaged with the distal and proximal ends of the tie rod, respectively. Similarly, tie rods 50 and 52 extend through each aligned bore 28 a′ and 28 b′, respectively, of the arcuate members 16 a and 18 a (tie rod 52 shown in FIG. 5). Nuts 54 a and 54 b are threadably engaged with the distal and proximal ends of the tied rod 50, respectively, and nuts 56 a and 56 b are threadably engaged with the distal and proximal ends of the tied rod 52, respectively (nut 56 b not shown).

In operation, with continuing reference to FIGS. 1-5, the pipes 12 and 14 form a fluid-transporting pipeline so that the pipes are subject to internal hydrostatic pressure. This internal pressure, along with any external forces present due to system-level or environmental conditions, results in forces being applied to the connection between the spigot of the pipe 12 and the bell 14 a of the pipe 14 which, in turn, urge the pipes 12 and 14 to axially separate or pull apart from each other.

However, pipe-restraining assembly 10 restrains or prevents the pipe 12 from appreciably moving axially relative to, or separating from, the pipe 14, and vice versa. The penetrating engagement of the ridges 32 a-32 d of the arcuate members 16 a and 16 b into the pipe 12 prevents the arcuate members from moving axially relative to the pipe 12. Likewise, the penetrating engagement of the ridges 32 a-32 d of the arcuate members 18 a and 18 b into the pipe 14 prevents the arcuate members from moving axially relative to the pipe 14. Further, the clamping forces generated by the threaded engagements of the tie rods 43, 46, 50 and 52 with the nuts 44 a and 44 b, 48 a and 48 b, 54 a and 54 b, and 56 a and 56 b, respectively, and applied to the corresponding lugs 28 a and 28 b, prevents the arcuate members 16 a and 16 b from moving axially relative to the arcuate members 18 a and 18 b, and vice versa. Since the arcuate members 16 a and 16 b, and 18 a and 18 b, are prevented from moving relative to the pipes 12 and 14, respectively, and from moving relative to each other, the pipes 12 and 14 are therefore prevented from appreciably moving relative to and/or axially separating from one another.

The sections of the ridges 32 a-32 d located in the portions 34 a and 34 b of the arcuate members 16 a and 16 b penetratingly engage the pipe 12 to a greater degree than the sections of the ridges 32 a-32 d that are located outside of the portions 34 a and 34 b. The aforementioned heat treatment of the portions 34 a and 34 b and the corresponding increase in hardness promotes the increased penetration of the ridges 32 a-32 d into the pipe 12 at the portions. Also, the inwardly-directed radial forces exerted on the pipe 12 by the arcuate members 16 a and 16 b are relatively higher at the portions 34 a and 34 b due to the portions' proximity to the clamping forces generated by the threaded engagement of the bolts 36 a and 36 b with the nuts 38 a and 38 b, respectively, and applied to the ears 20 a and 20 b, respectively, thereby further promoting the increased penetration of the ridges 32 a-32 d into the pipe at the portions.

In a like manner, the sections of the ridges 32 a-32 d located in the portions 34 a and 34 b of the arcuate members 18 a and 18 b penetratingly engage the pipe 14 to a greater degree than the sections of the ridges 32 a-32 d that are located outside of the portions 34 a and 34 b. Thus, the increased penetration of the ridges 32 a-32 d at the portions 34 a and 34 b further prevents the arcuate members 16 a and 16 b, and 18 a and 18 b, from moving relative to the pipes 12 and 14, respectively, thereby further inhibiting any axial separation of the pipes.

Referring to FIG. 6, another embodiment of a pipe-restraining assembly is generally referred to by the reference numeral 58. The embodiment shown in FIG. 6 is similar to the embodiment shown in FIGS. 1-5 and contains several parts of the embodiment which are given the same reference numerals. In the embodiment of FIG. 6, a recess 60 is formed in the curved surface 30 and the surface defined by the chamfer 22 b so that the recess is adjacent the horizontal surface 24 b. A plate or insert 62 is disposed in the recess 60 and connected to the arcuate member 16 a. A pair of protrusions or ridges 64 a and 64 b extend radially inward from the insert 62 so that the distal ends of the ridges 64 a and 64 b are radially offset from the curved surface 30. The ridges 64 a and 64 b also extend along the length of the insert 62, thereby substantially extending along a section of the length of the curved surface 30. The arcuate member 16 a has a substantially uniform material hardness. The insert 62 and the ridges 64 a and 64 b have a material hardness that is higher than the material hardness of the arcuate member 16 a.

In a like manner, inserts identical to the insert 62 are disposed in recesses formed in the opposing end of the arcuate member 16 a, and in the opposing ends of the arcuate members 16 b, 18 a and 18 b. It is understood that, with the exception of the foregoing, the pipe-restraining assembly 58 is identical to the pipe-restraining assembly 10 and therefore will not be further described.

The operation of the embodiment of FIG. 6 is similar to that of FIGS. 1-5, except that the ridges 64 a and 64 b extending from the insert 62, and the ridges extending from the other inserts connected to the arcuate members 16 a, 16 b, 18 a and 18 b, penetratingly engage the pipes 12 and 14 to a greater degree than the ridges 32 a-32 d extending from the curved surfaces 30 of the arcuate members.

Variations

It is understood that variations may be made in the foregoing without departing from the scope of the disclosure. For example, only one pair of arcuate members 16 a and 16 b, or 18 a and 18 b, may include the ridges 32 a-32 d.

Further, instead of connecting the pair of arcuate members 16 a and 16 b to another pair of identical arcuate members such as the arcuate members 18 a and 18 b, the pair of arcuate members 16 a and 16 b could be connected to the restrained sleeve pipe coupling and/or one or more of the corresponding end rings disclosed in co-pending patent application Ser. No. 10/170,477, published on Dec. 18, 2003 as U.S. patent application publication no. 2003/0230897 A1, the disclosure of which is incorporated by reference.

Still further, the pair of arcuate members 16 a and 16 b could be employed in conjunction with a conventional flanged connection between a pipe having a flange and a pipe having a plain end. The arcuate members 16 a and 16 b could be clamped together around the pipe having the plain end in a manner described above, and the tie rods 43, 46, 50 and 52 could extend from the arcuate members 16 a and 16 b and through bores formed in the flange. The nuts 44 b, 48 b, 54 b and 56 b could then be threadably engaged with the tie rods 43, 46, 50 and 52, respectively, to apply clamping forces to the flange and promote a flanged connection that is more resistive to any forces tending to separate the pipes. It is understood that the flanged connection may be between straight pipe sections, curved pipe sections, etc. or any combination thereof.

In view of the foregoing, it is understood that the pair of arcuate members 16 a and 16 b, or 18 a and 18 b, may be clamped around any pipe in any type of application where it is desired to form a ring around the pipe and maintain the as-installed position of the arcuate members relative to the pipe, notwithstanding the subsequent subjection of the installed arcuate members, or ring, to various static and/or dynamic loads in various directions.

Additional variations include the following:

-   -   1. The quantity and spacing of the lugs 28 a and 28 b and any         corresponding tie rods may be varied.     -   2. The pipes 12 and 14 may be made of other material such as,         for example, high-density polyethylene. It is understood that         the pipes 12 and 14 may be made of many different types of         materials having widely varying material hardness levels.     -   3. In addition to the employment of ears, bolts and nuts, the         arcuate members 16 a and 16 b, and 18 a and 18 b, may be         connected using other conventional fastening means such as, for         example, with clamps.     -   4. The number of ridges extending from the curved surface 30 and         the insert 62 may be varied. Further, the size, shape, location,         spacing and cross-sectional profile of the ridges 32 a-32 d and         64 a-64 b may be varied. For example, the ridges 32 a-32 d and         64 a-64 b may have rectangular, triangular or arcuate         cross-sections, or any combination thereof.     -   5. For the embodiment of FIGS. 1-5, the locations and size of         the portions 34 a and 34 b may be varied, and the quantity of         the portions may be varied. For the embodiment of FIG. 6, the         quantity, locations and size of the inserts 62 may be varied.     -   6. In addition to the above-described spigot-and-bell and         flanged connections, the pipe-restraining assembly 10 and/or 58         and/or any variation thereof may be used with other types of         pipe connections.     -   7. The cross-sectional profiles and the locations of the arcuate         members 16 a, 16 b, 18 a and 18 b relative to the connection         between the pipes 12 and 14 may be varied.     -   8. In addition to tie rods, other fastening means may be         employed to connect the pair of arcuate members 16 a and 16 b to         the pair of arcuate members 18 a and 18 b such as, for example,         cables and turnbuckles, bolts, etc. or any combination thereof.     -   9. The lengths of the tie rods 43, 46, 50 and 52 and the bolts         36 a, 36 b, 40 a and 40 b may be varied.     -   10. For the embodiment of FIG. 6, different portions of the         arcuate members 16 a, 16 b, 18 a and 18 b may have different         material hardness levels, instead of the arcuate members having         a substantially uniform hardness level.     -   11. For the embodiments of FIGS. 1-5 and FIG. 6, different         portions of the curved surfaces 30, and the balance of the         arcuate members 16 a, 16 b, 18 a and 18 b, may have differing         material hardness levels. For example, there may be three or         more material hardness levels in a single arcuate member in         either embodiment.     -   12. The pipe-restraining assemblies 10 and 58 may be combined so         that one pair of arcuate members employs the inserts 62 while         the other pair of arcuate members does not.     -   13. Additional pairs of arcuate members may be clamped around         the same or additional pipes. These additional pairs may be         connected to the arcuate members 16 a and 16 b and/or 18 a and         18 b.     -   14. The arcuate members 16 a and 16 b may be modified so that         the surfaces 24 a and 24 b of each arcuate member 16 a and 16 b         do not contact the corresponding surfaces 24 a and 24 b,         respectively, of the other arcuate member. The arcuate members         18 a and 18 b may also be modified in this manner.     -   15. Any foregoing spatial references, such as “upper,” “lower,”         “above,” “below,” “between,” “vertical,” “angular,” etc., are         for the purpose of illustration only and do not limit the         specific orientation or location of the structure described         above.

Although only a few exemplary embodiments of this invention have been described in detail above, those skilled in the art will readily appreciate that many other modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the following claims. In the claims, means-plus-function clauses are intended to cover the structures described herein as performing the recited function and not only structural equivalents, but also equivalent structures. 

1. Apparatus comprising: a pair of removably connectable arcuate members for clamping around a pipe, each arcuate member comprising: a curved surface comprising first and second opposing ends, and at least one protrusion substantially extending radially inward and including a distal end that is radially spaced from the curved surface, the at least one protrusion substantially extending at least partially along the length of the curved surface; wherein each arcuate member has a first material hardness and at least a first portion of the at least one protrusion has a second material hardness, wherein the second material hardness is greater than the first material hardness, and wherein the first portion of the at least one protrusion is adjacent one of the first and second opposing ends of the curved surface.
 2. The apparatus of claim 1 wherein a second portion of the at least one protrusion has the second material hardness, and the first portion is adjacent the first opposing end and the second portion is adjacent the second opposing end.
 3. The apparatus of claim 1 wherein the at least one protrusion extends at least partially along the length of the curved surface.
 4. The apparatus of claim 3 wherein the at least one protrusion has the second material hardness substantially along its entire length.
 5. The apparatus of claim 1 wherein each arcuate member further comprises: at least one recess formed in the curved surface; and a plate disposed in the recess; wherein the at least one protrusion comprises at least one ridge extending from the plate; and wherein the at least one ridge has the second material hardness.
 6. Apparatus comprising: a pair of removably connectable arcuate members for clamping around a pipe, each arcuate member comprising; a curved surface including first and second opposing ends; and a first recess formed in the curved surface and adjacent one of the first and second opposing ends; a first plate connected to each arcuate member and disposed in the corresponding first recess; and a first protrusion extending from each first plate; wherein each arcuate member has a first material hardness and each first protrusion has a second material hardness, wherein the second material hardness is greater than the first material hardness.
 7. The apparatus of claim 6 further comprising at least one ridge extending from each curved surface.
 8. The apparatus of claim 6 wherein each arcuate member further comprises a second recess formed in the curved surface and adjacent the other of the first and second opposing ends.
 9. The apparatus of claim 8 further comprising: a second plate connected to each arcuate member and disposed in the corresponding second recess; and a second protrusion extending from each second plate and having the second material hardness.
 10. Apparatus comprising: a pair of removably connectable arcuate members for clamping around a pipe, each arcuate member comprising: a curved surface including opposing first and second ends; first and second recesses formed in the curved surface and adjacent the first and second ends, respectively; and at least one ridge extending radially inward from the curved surface and along the length of the section of the curved surface located between the first and second recesses; first and second plates disposed in the first and second recesses, respectively; and first and second protrusions extending radially inward from the first and second plates, respectively; wherein the arcuate members have a first material hardness and at least respective portions of the first and second protrusions have a second material hardness, wherein the second material hardness is greater than the first material hardness.
 11. The apparatus of claim 10 wherein each of the first and second protrusions penetratingly engages the pipe when the arcuate members are clamped around the pipe; and wherein the at least one ridge penetratingly engages the pipe when the arcuate members are clamped around the pipe. 